1975 Datsun 280z FSM - Spooled up Racing

Engine Lubrication System
not adjustable. At the released position,
the valve permits the oil to
by-pass through the passage in the
pump cover to the inlet side of the
pump. Check regulator valve spring to
ensure that spring tension is correct.
EL014
Fig. EL-8 Regulator valve
Specifications
Regulator valve spring
Free length
Installed length/load
mm (in)
mm/kg (in/lb)
52.5 (2.067)
34.8/7.9 to 8.7 (1.370/17.4 to 19.2)
OIL FILTER
The oil filter is of a cartridge type.
The oil filter element should be replaced
every 10,000 km (6,000 miles)
of operation, with the use of Oil Filter
Wrench ST19320000. See Figure
EL-9.
When removing an oil filter, loosen
it after stopping engine about several
minutes to drain out the oil from oil
filter to oil pan.
When installing an oil filter, fasten
it on cylinder block by hand.
Note: Do not overtighten filter, or oil
leakage may occur.
OIL PRESSURE
RELIEF VALVE
The relief valve located at the
center portion securing oil filter in the
cylinder block by-passes the oil into
the main gallery when the oil filter
element is excessively clogged.
With oil filter removed, check valve
unit for operation. Inspect for a
cracked or broken valve. If replacement
is necessary, remove valve by
prying it out with a screwdriver. Install
a new valve in place by tapping it in.
OIL PRESSURE
WARNING SWITCH
The oil warning switch is located on
right hand center of cylinder block
and wired to an indicator lamp in the
instrument cluster.
The warning light glows whenever
the oil pressure drops below 0.2 to 0.4
kg/cm 2 (2.8 to5.7psi).
Prior to installing a switch to cylinder
block, be sure to apply a
conductive sealer to threads of new
switch.
EL015
Fig. EL-9 Removing oil filter
Fig.EL-10 Relief valve
EL-4